JP2014103869A - Torque leveling mechanism of planting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working machine capable of inhibiting the occurrence of backlash of a gear constituting a driving system or uneven rotation of the driving system due to rattle caused by a gap between parts in manufacturing the driving system to stabilize the operation and improve the operability by a torque leveling mechanism for efficiently inhibiting torque fluctuation generated in the driving system using elastic force of an elastic body, the torque leveling mechanism being provided in a mechanical working device.SOLUTION: A driving system (a mechanical working device) to a planting claw 17, which takes out the driving force through a transmission case 4, is provided with a torque leveling mechanism 101. The torque leveling mechanism 101 is provided to inhibit the occurrence of backlash of a gear constituting the driving system or uneven rotation of the driving system due to rattling or torsion of the driving system caused by a gap between parts in manufacturing the driving system by using elastic force of a coil spring 103 (an elastic body).

Description

  The present invention is a machine working device for taking out a driving force through a transmission case, and a torque leveling mechanism is provided in a drive system of the machine working device, and the torque leveling mechanism is configured to reduce the elastic force of an elastic body. The present invention relates to a mechanical working apparatus provided to suppress the occurrence of rotation unevenness of a drive system due to backlash of a gear constituting a drive system or play caused by a gap generated between parts during manufacture of the drive system or torsion of the drive system.

  2. Description of the Related Art Conventionally, for example, a seedling transplanter (rice transplanter) having a working machine equipped with a mechanical working device has an elliptical gear or eccentricity in a transmission system up to a planting drive means for driving a planting arm in a planting unit. A non-circular gear such as a gear or an inconstant speed mechanism such as an elliptical sprocket is provided so that the planting arm that supports the planting claw is loosened during one rotation. In this way, when the planting claw receives the seedling from the seedling stage, the faster the planting arm rotates, the faster the planting claw will enter the seedling on the seedling stage. Immediately after scraping, the ability to cut seedlings is increased, and the rotational speed of the planting arm is slowed down in order to decelerate the rotational drive in order to counteract the driving force trying to rotate at high speed by releasing from the scraping load. When planting the scraped seedlings, move the planted seedlings downward, and increase the rotation speed of the planting arm so that the planted claws do not come into contact with the planted seedlings and cause poor planting. In some cases, the planting locus is optimized (for example, Patent Documents 1 and 2).

JP 63-141512 A Japanese Patent Laid-Open No. 07-163216

However, in a seedling transplanter having a working machine equipped with a mechanical working device as described above, the planting transmission shaft system such as the planting arm rotates at an inconstant speed by the inconstant speed mechanism, so that torque fluctuations occur. This generates torsional vibration in the planted transmission shaft system. For this reason, the acceleration / deceleration timing shift occurs in the planting arm and the speed amplitude increases, so that the planting claw cannot obtain the designed locus, which causes a problem in planting work.
Accordingly, an object of the present invention is to provide a torque leveling mechanism in the machine work device that efficiently suppresses torque fluctuations generated in the drive system of the machine work device using the elastic force of the elastic body. The mechanism stabilizes the work by suppressing the backlash of the gears that make up the drive system or the backlash caused by gaps between parts during drive system manufacture and the drive system rotation unevenness caused by the drive system torsion. A work machine with improved performance is provided.

  For this reason, the invention according to claim 1 is a machine working device for taking out a driving force through a transmission case, wherein a torque leveling mechanism is provided in a drive system of the machine working device, and the torque leveling mechanism is provided. Using the elastic force of the elastic body, the backlash of the gear constituting the drive system or the rotation unevenness of the drive system due to the backlash caused by the gap generated between the parts during the manufacture of the drive system or the twist of the drive system is generated. It is provided to suppress this.

  According to a second aspect of the present invention, in the machine working device according to the first aspect, the torque leveling mechanism uses a crank mechanism and a spring.

  A third aspect of the present invention is a working machine including the mechanical working device according to the first or second aspect, wherein the working machine is driven from the mission case via a PTO shaft.

  Invention of Claim 4 is a seedling transplanter provided with the PTO axis | shaft of Claim 3, Comprising: The planting drive member which drives a planting arm by driving a planting drive means is provided. And

  A fifth aspect of the present invention is the seedling transplanter according to the fourth aspect of the present invention, characterized in that an inconstant speed gear is provided in a transmission shaft system of a drive system including the PTO shaft.

  According to the first aspect of the present invention, since the driving force is taken out through the transmission case, the torque leveling mechanism is provided in the drive system of the machine working device. However, by using the elastic force of the elastic body, the backlash of the gears constituting the drive system or the occurrence of rotation unevenness of the drive system due to backlash caused by gaps between parts during drive system manufacture or torsion of the drive system can be suppressed. Can do. Therefore, it is possible to provide a machine working device with improved workability.

  According to the second aspect of the present invention, since the torque leveling mechanism uses the crank mechanism and the spring, the torque fluctuation having the opposite phase to the torque fluctuation generated in the drive system is generated using the expansion and contraction motion of the spring. By effectively canceling the torque fluctuation, it is possible to smoothly perform the inconstant motion. Therefore, it is possible to provide a machine working device with improved workability.

  According to the third aspect of the present invention, since the working machine is driven from the transmission case via the PTO shaft, the torque generated in the power transmitted to the drive system including the inconstant speed mechanism via the PTO shaft. The fluctuation can be efficiently suppressed by the torque leveling mechanism. Therefore, it is possible to improve the workability of all work machines to which power is transmitted via the PTO shaft.

  According to invention of Claim 4, since it is a seedling transplanting machine provided with a PTO axis | shaft and is equipped with the planting drive member which drives a planting drive means and drives a planting arm, it is like a seedling transplanting machine. The torque fluctuation of the planting drive member with a non-uniform speed can be efficiently suppressed by the torque leveling mechanism. Therefore, a seedling transplanter with improved workability can be provided.

  According to the invention described in claim 5, since it is a seedling transplanting machine and includes the inconstant speed gear in the transmission shaft system of the drive system including the PTO shaft, the planting arm that supports the planting claw is When the planting claws receive seedlings from the seedling stage during one rotation, the faster the planting arm rotates, the faster the planting claws enter the seedlings on the seedling stage. The ability to cut the seedling should be increased, and immediately after scraping, the rotational speed of the planting arm is slowed down in order to decelerate the rotational drive to cancel the driving force that tries to rotate at high speed by releasing from the scraping load, Furthermore, when planting the scraped seedlings, the planted seedlings are moved downward, and the rotation speed of the planting arm is increased so that planting claws do not come into contact with the planted seedlings to cause planting defects. Therefore, the planting locus can be optimized. Therefore, a seedling transplanter with improved workability can be provided.

1 is an overall side view of a seedling transplanter (rice transplanter) as an example of the present invention. It is an expanded side view of the planting part which illustrates the working machine in a seedling transplanter. It is a top view of a planting part. It is a whole perspective view of the planting part which provided the crank mechanism and a spring as a torque leveling mechanism in the both ends of the planting drive horizontal axis. It is an expansion perspective view of the planting drive horizontal-axis end part which provided the torque leveling mechanism. It is a side view of the torque leveling mechanism explaining an internal structure. It is explanatory drawing which showed the state of the torque which generate | occur | produces and adds to a planting drive horizontal axis. It is a side view of the torque leveling mechanism which shows an example of the elastic force adjustment mechanism which changes the elastic force of a coil spring. It is a cross-sectional rear view of the planting drive horizontal axis showing an example of a torque leveling mechanism provided in the upper part of the middle part of the planting drive horizontal axis. FIG. 10 is an explanatory diagram of the torque leveling mechanism of FIG. 9. It is a section top view of a planting drive horizontal axis which shows an example of a torque leveling mechanism provided in the front part of a planting drive horizontal axis middle part. It is EE sectional drawing of the torque leveling mechanism in FIG.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is an overall side view of a seedling transplanter (rice transplanter) as an example of the present invention, FIG. 2 is an enlarged side view of a planting unit illustrating a working machine in the seedling transplanter, and FIG. 3 is a plan view of the planting unit. FIG.

  The seedling transplanter (rice transplanter) 1 of the present application is a vehicle on which an operator is boarded, and a six-row planting will be described as an example. As shown in FIGS. 1 and 2, the engine 2 is mounted on a vehicle body frame 3, and a front wheel 6 for paddy field traveling is supported via a front axle case 5 in front of a mission case 4 that is long in the front-rear direction. The rear axle case 7 at the rear of the case 4 is supported by the rear wheel 8 for paddy field traveling.

  The spare seedling platforms 10 are attached to both sides of the bonnet 9 that covers the engine 2 and the like, and the transmission case 4 is covered with the vehicle body cover 11 on which the operator rides. A steering handle 14 is provided at the rear of the hood 9 in front of the driver's seat 13.

  Moreover, the planting part 15 illustrated as a working machine is equipped with the seedling mounting stand 16 for 6 row planting, the some seedling planting nail | claw 17, etc., and the front inclination type by the synthetic resin of front high back low The seedling stage 16 is supported by the planting frame 20 via the lower rail 18 and the guide rail 19 so as to be slidable in the left and right directions, and a rotary case 21 that is rotated in one direction is supported by the planting frame 20. A pair of planting arms 22 are arranged at symmetrical positions around the rotational axis 21, and the planting claws 17 are attached to the tips of the planting arms 22.

  In addition, left and right side frames 23 are erected on both right and left ends of the planting frame 20 to support the seedling table 16, and a hitch bracket 24 at the center of the planting frame 20 is moved up and down including the top link 25 and the lower link 26. It is connected to a vehicle via a mechanism 27, a hydraulic lift cylinder 28 provided on the vehicle is connected to a lower link 26, and when the lift cylinder 28 is driven, the planting portion 15 is lifted and lowered via the lift mechanism 27. When the planting part 15 is lowered, one seedling is taken out by the planting claw 17 from the seedling mount 16 that is reciprocated to the left and right, and the seedling planting operation can be continuously performed.

  Reference numeral 29 is a main transmission lever, 30 is a seeding lever, 32 is a main clutch pedal, 34 is a center float, 35 is a side float, 36 is a fertilizer, and 37 is an auxiliary wheel provided outside the rear wheel 8. .

  Further, the fertilizer applicator 36 is provided with a fertilizer hopper 38 for supplying fertilizer, a fertilizer feeding case 39 which is a fertilizer feeding portion for supplying fertilizer, and a side groove grooving device 40 for the floats 34 and 35 via a flexible conveying hose 41. A turbo blower type blower 42 for discharging fertilizer and a cylindrical air tank 43 are provided. The blower 42 is attached to the right end of the air tank 43, and a fertilizer feeding case 39 is disposed on the upper side of the air tank 43. The upper end of the seedling stage 16 is arranged close to the rear side.

  Next, as shown in FIGS. 2 to 3, the planting frame 20 includes left and right vertical frames 44 made of pipes for two strips, and a horizontal frame 45 made of pipes connecting between the front ends of the left and right vertical frames 44. The cruciform joint 46 is welded and fixed to the rear end of each vertical frame 44, the rotary case 21 is rotatably supported by the cruciform joint 46 via the rotary shaft 47, and the cruciform joints 48a and 48b are vertically supported. The frame 44 and the horizontal frame 45 are fixed by welding, and the vertical and horizontal frames 44 and 45 are integrally connected.

  In addition, a planting input shaft 49 is provided at the front end portion of the cross pipe joint 48b, and the driving force from the PTO shaft 33 of the transmission case 4 is transmitted to the planting input shaft 49 via the universal shaft joint. A planting input shaft 49 is linked to a planting drive horizontal shaft 51 of a planting drive means installed through a bevel gear 52 and a planting drive vertical axis 53 of a planting drive unit installed in the left and right vertical frame 44. Are connected to the planting drive horizontal shaft 51 via bevel gears 49a, 49b, etc., and the planting drive vertical shaft 53 is linked to the rotary shaft 47 via a bevel gear 50 (described later) and a planting claw unit clutch (not shown), respectively. A mechanical working device that drives the planting claws 17 is configured.

  In the above description, the transmission of the driving force from the PTO shaft 33 of the mission case 4 is performed using a shaft (planting input shaft 49, planting drive horizontal shaft 51, planting drive vertical shaft 53, rotating shaft 47). However, there is no particular limitation as long as the driving force can be transmitted. For example, a configuration using a chain may be used.

  A gear case 62 is provided on the upstream side of the PTO shaft 33 that transmits power to the planting input shaft 49. An input shaft (not shown) installed in the gear case 62 and an output shaft are respectively provided. Between the intermediate shaft and the output shaft, a non-circular gear such as a pair of eccentric gears is provided as a well-known inconstant speed mechanism. During one rotation of the planting drive horizontal shaft 51, the rotational speed of the rotary shaft 47 partially appears in the maximum speed state and the inconstant speed state in which the rotational speed becomes the minimum speed. A power transmission member from the gear case 62 to the planting claw 17 serves as a drive system described later in the planting unit 15.

  Further, a seedling feed shaft 58 that performs lateral feed in the left-right direction of the seedling table 16 and vertical feed of the seedlings on the seedling table 16 is linked to the left end of the planting drive horizontal shaft 51 via a seedling feed case 59. One end side flange portion 61 of the seedling feeding case 59 is bolted and fixed to the left side flange portion 60 of the cruciform joint 48a, and the left end of the seedling feeding shaft 58 is inserted and supported to the other end side of the seedling feeding case 59. A speed change mechanism 64 formed by two sets of high and low speed change gears is interposed between the planting drive horizontal shaft 51 and the seedling feed shaft 58 in the case 59, and the left half of the seedling feed shaft 58 with respect to the substantial center of the machine body. The seedling vertical feed cam shaft 65 and the right half are provided on the seedling table horizontal feed screw shaft 66, and the seedling feed table 58 is driven by the horizontal feed of the seedling feed shaft 58 at the high and low speeds, and the seedlings on the seedling stand 16 are driven. It is set as the structure which performs the vertical feed.

  Next, the torque leveling mechanism provided in the mechanical working device of the planting part 15 in the seedling transplanter 1 of the present invention will be described in detail. FIG. 4 is an overall perspective view of a planting portion provided with a crank mechanism as a torque leveling mechanism and springs at both ends of the planting drive horizontal shaft, and FIG. 5 is an end portion of the planting drive horizontal shaft provided with a torque leveling mechanism. FIG. 6 is a side view of a torque leveling mechanism for explaining the internal structure, and FIG. 7 is an explanatory view showing a state of torque generated and applied to the planting drive horizontal axis.

  The torque leveling mechanism 101 includes, for example, a crank arm 102 and a coil spring 103 (spring) as shown in FIGS. 4 to 5, and is provided in a case 100 installed at both ends of the planting drive horizontal shaft 51. The case 100 includes a cover 99 that is closed by bolt fixing or the like.

  Specifically, for example, the crank arm 102 is linked to the planting drive horizontal shaft 51 at the end of the planting drive horizontal shaft 51 with the bevel gears 49a, 49b, and 49c interposed therebetween. One end of the crank arm 102 is connected to the planting drive horizontal shaft 51, and a boss 107a for fixing one end of the coil spring 103 is provided at the other end. One end of the coil spring 103 is fixed to a boss 107 a provided on the crank arm 102, and the other end is fixed to a boss 107 b provided on the case 100, and the coil spring 103 is constantly contracted.

  Then, the elastic force (contracting force) of the coil spring 103 is generated as rotational torque on the planting drive horizontal shaft 51 via the crank arm 102.

  Next, the torque generated by the above-described torque leveling mechanism 101 will be described in detail with reference to FIGS. First, in FIG. 6, the planting drive horizontal shaft 51 is rotated clockwise (clockwise) with respect to the rotation center O <b> 1, and the crank arm 102 is also rotated right in the same manner, and the boss 107 a provided on the crank arm 102 is The elastic force of the coil spring 103 is acting. 6 indicates a direction in which the elastic force of the coil spring 103 acts on the boss 107.

  The direction of the torque (leveling torque) generated in the planting drive horizontal shaft 51 by the elastic force of the coil spring 103 is determined when the rotation angle θ1 of the planting drive horizontal shaft 51 is 0 ° <θ1 <180 °. The rotation direction of the drive horizontal shaft 51 is opposite to that of the drive shaft 51. When 180 ° <θ1 <360 °, the rotation direction of the rotation shaft 106 is the same.

  As the rotation angle θ1 of the planting drive horizontal shaft 51 increases from 0 °, the angle θ2 formed by the direction of the arm of the crank arm 102 and the direction of the elastic force of the coil spring 103 decreases from 180 ° to 90 °. Therefore, the torque (leveling torque) generated in the planting drive horizontal shaft 51 by the elastic force of the coil spring 103 increases.

  Thereafter, the leveling torque becomes the maximum value, and when the rotation angle θ1 further increases, θ2 decreases and approaches 0 °, and thus the leveling torque decreases. When the rotation angle θ1 is 180 °, the rotation angle θ2 is 0 °. Therefore, the elastic force of the coil spring 103 acts along a straight line passing through the rotation center O1 of the planting drive horizontal shaft 51. The torque is zero.

  Next, as the rotation angle θ1 increases from 180 °, the rotation angle θ2 increases from 0 ° and approaches 90 °, so that the leveling torque increases.

  After that, the leveling torque becomes the maximum value, and when the rotation angle θ1 further increases, the rotation angle θ2 increases and approaches 180 °, so that the leveling torque decreases. Since the rotation angle θ2 is 180 ° when the rotation angle θ1 is 360 °, the elastic force of the coil spring 103 acts along a straight line passing through the rotation center O1 of the planting drive horizontal shaft 51. The torque is zero. In this way, the leveling torque changes periodically.

  Here, when the planting claws 17 enter the seedlings on the seedling mounting table 16 and when the seedlings remaining on the planting claws 17 are shaken down after planting the seedlings, the rotational driving of the planting arms 22 is made faster. In order to loosen the rotational speed of the planting arm 22 when planting the seedlings, the planting driving means such as the planting arm 22 is rotated at an unequal speed by the unequal speed mechanism.

  That is, the torque fluctuation generated when the planting drive means such as the planting arm 22 rotates at an unequal speed is generated during the rotation of the rotary case 21 (the planting claw 17 cuts the seedling on the seedling table 16). However, it becomes a periodic fluctuation having two peaks during planting in the field.

  Therefore, in order to cancel this torque fluctuation, the rotational speed of the planting drive horizontal shaft 51 is changed by the bevel gear 50c so that the leveling torque has an opposite phase. In addition, the crank arm 102 (arms) may be selected according to the size of the machine (number of strips and diameter of the planting drive horizontal shaft 51), the constant speed / unconstant speed reduction ratio of the planting drive means, or the planting speed. ) And the coil spring 103 (tension) are appropriately replaced and installed to generate an optimum torque.

  The combined torque 110 obtained by combining the torque 108 generated by the inconstant speed mechanism, the torque 109 generated by the torque leveling mechanism 101, and the combined torque 110 is as shown in FIG. Become. A, B, C, and D in FIG. 7 indicate leveling torques when the center O2 of the boss 107a in FIG. 6 is located at A, B, C, and D, respectively.

  By adopting such a configuration, it is possible to generate torque fluctuation in the opposite phase to the torque fluctuation generated in the planting drive horizontal shaft 51 by the elastic force of the coil spring 103, and the torque leveling mechanism 101 makes the rotation faster. The torque fluctuation generated in the planting drive horizontal shaft 51 which becomes larger as the time elapses is cancelled.

  In other words, the elastic force of the coil spring 103, which is an elastic body, is used to suppress the occurrence of rotation unevenness in the drive system due to backlash of gears constituting the drive system or play due to gaps generated between parts during manufacture of the drive system. As a result, the planting drive horizontal shaft 51 can smoothly rotate at a non-uniform speed without twisting or rattling, and the planting state of the seedling by the planting claws 17 at high speed can be stabilized.

  Further, the torque leveling mechanism 101 uses the elastic force of the coil spring 103 as the rotational torque. That is, the torque fluctuation generated in the planting drive horizontal shaft 51 is stored in the coil spring 103, and the torque (phased torque) having the opposite phase to the torque fluctuation generated by using the expansion and contraction motion of the coil spring 103 is stored. Is returned to the planting drive horizontal shaft 51 as a drive torque, so that the torque fluctuation can be canceled out. In addition, the configuration is simple, light and compact, and maintenance and adjustment of generated torque (leveling torque) can be easily performed, and the current configuration of the planting drive horizontal shaft 51 can be arranged without greatly changing.

  Further, even when the planting drive horizontal shaft 51 rotates at a high speed, the expansion and contraction motion of the coil spring 103 follows this high-speed rotation motion. Therefore, even if the torque fluctuation generated in the planting drive horizontal shaft 51 is a high-frequency torque fluctuation. Can be absorbed.

  Furthermore, the torque leveling mechanism 101 is covered by the case 100 and the cover 99, so that mud etc. is prevented from adhering to the torque leveling mechanism 101, the occurrence of malfunctions, and the hands to the rotating members such as the crank arm 102 and the coil spring 103 are prevented. Safety measures can be taken by preventing contact and the like.

  The above-described torque leveling mechanism 101 is preferably installed at both ends of the planting drive horizontal shaft 51 in terms of stability of torque leveling of the planting drive means. The structure which installed the torque leveling mechanism 101 in the part may be sufficient.

  Further, the torque leveling mechanism 101 may be provided with an elastic force adjusting mechanism 130 that changes the length (elongation) of the coil spring 103 and changes the elastic force generated in the coil spring 103. FIG. 8 is a side view of a torque leveling mechanism showing an example of an elastic force adjusting mechanism that changes the elastic force of the coil spring.

  For example, as shown in FIG. 8, the elastic force adjusting mechanism 130 includes a link mechanism including an upper stay 107, a link bar 131, and a link bar 132 that are slidable in the vertical direction. The upper stay 107 extends through a vertically long opening 136 provided in the cover 104 and can slide in the opening 136 in the vertical direction. Note that the movement of the upper stay 107 in the left-right direction is restricted by the left and right edges of the opening 136. One end of the link bar 131 is pivotally attached to the upper stay 107, and the other end is pivotally attached to the link bar 132 via a pivot shaft 133. The link bar 132 is rotatably supported by a rotation support shaft 134 provided on a flange 135 extending from the cover 104. The upper stay 107 is fixed by fixing the link bar 132 with a bolt or the like (not shown).

  By moving the outer end of the link bar 132 downward, the upper stay 107 moves upward, and the elastic force generated in the coil spring 103 can be increased by increasing the elongation of the coil spring 103. Further, by moving the outer end of the link bar 132 upward, the upper stay 107 moves downward, and the elongation of the coil spring 103 is reduced, so that the elastic force generated in the coil spring 103 can be reduced.

  Therefore, by providing the elastic force adjusting mechanism 130 having a simple configuration, the elastic force acting on the crank arm 102 can be changed without replacing the coil spring 103, and the leveling torque by the torque leveling mechanism 103 can be easily obtained. Can be changed. Furthermore, the upper stay 107 can be moved downward until the coil spring 103 is no longer stretched to eliminate the elastic force of the coil spring 103, and whether or not the torque leveling mechanism 103 generates leveling torque to the planting drive transmission member. Can be switched. In addition, when replacing the coil spring 103, the upper stay 107 can be moved downward to reduce or eliminate the elastic force of the coil spring 103. Therefore, the coil spring 103 can be easily replaced.

  The elastic force adjusting mechanism 130 is not limited to the above-described configuration, and it is sufficient that the elastic force generated in the coil spring 103 can be changed by changing the length (elongation) of the coil spring 103. A mechanism such as a wire may be used. Furthermore, it is good also as a structure which can operate the elastic force adjustment mechanism 130 from the driver's seat 13 etc. by well-known link mechanisms, such as a rod and a wire.

  Further, the torque leveling mechanism can be provided in the middle of the planting drive horizontal shaft 51. FIG. 9 is a cross-sectional rear view of the planting drive horizontal axis showing an example of the torque leveling mechanism provided in the upper part of the middle part of the planting drive horizontal axis, FIG. 10 is an explanatory diagram of the torque leveling mechanism of FIG. A cross-sectional plan view of the planting drive horizontal axis showing an example of the torque leveling mechanism provided in the front part of the planting drive horizontal axis halfway part, FIG. 12 is a cross-sectional view of the torque leveling mechanism in FIG.

  In this case, as shown in FIGS. 9 to 10, for example, in the middle part of the horizontal frame 45 (the position close to the center of the planting drive horizontal shaft 51 in the illustrated example) in which the planting drive horizontal shaft 51 is provided, 100 'is attached, and in this case 100', a part of the crank arm 102 'fixed around the planting drive horizontal shaft 51 and a coil spring provided on the upper part (not limited) of the planting drive horizontal shaft 51 are provided. A torque leveling mechanism 101 ′ composed of 103 ′ or the like is accommodated.

  In this torque leveling mechanism 101 ′, for example, the crank arm 102 ′ is configured with an inclined surface 98 having one inclined surface, and the roller 112 of the caster 111 provided at the tip of the coil spring 103 ′ is inclined. 98 is pressed and brought into contact with the elasticity of the coil spring 103 '. An arm 113 wound with a coil spring 103 ′ connected to the caster 111 is slidably supported inside the case 100 ′.

  Here, as described above, the acceleration / deceleration power transmitted to the planting drive horizontal shaft 51 via the inconstant speed mechanism in the gear case 62 is transmitted to the crank arm 102 via the shaft rotation of the planting drive horizontal shaft 51. ', But when the roller 112 of the caster 111 moves along the inclined surface 110 of the crank arm 102', the arm 112 also slides left and right via the coil spring 103 '.

  At this time, the torque fluctuation generated in the planting drive horizontal shaft 51 is stored in the coil spring 103 ′ in the same manner as described above, and the stored energy is opposite in phase to the torque fluctuation generated by using the expansion and contraction motion of the coil spring 103 ′. Is returned to the planting drive horizontal shaft 51 as a drive torque, so that the torque fluctuation can be canceled out.

  For this reason, the stable inconstant speed power without torsional vibration can be transmitted to the planting drive vertical axis 53, and the planting transmission shaft system of the planting part 15 including the planting drive horizontal axis 51 is the above-mentioned. Due to the cause or the like, the rotation can be smoothly performed at a constant speed without twisting or rattling, and the seedling transplanting machine 1 in this case can stabilize the seedling planting state with the planting claws at high speed.

  With such a configuration, the torque leveling mechanism 101 ′ is a mechanism for storing and releasing torque, so that it does not become a load for planting driving or traveling. In addition, the configuration is simple, lightweight and compact, and maintenance and adjustment of the generated torque can be easily performed, and the current planting transmission shaft system can be arranged without greatly changing the configuration. Further, the torque leveling mechanism 101 ′ formed of the coil spring 103 ′ can absorb high-frequency torque fluctuations because the expansion and contraction movement of the coil spring 103 ′ follows even at high speed rotation.

  Further, the torque leveling mechanism can be composed of a cam and a spring. In this case, as shown in FIGS. 11 to 12, for example, in the middle part of the horizontal frame 45 (the position close to the center of the planting drive horizontal shaft 51 in the illustrated example) in which the planting drive horizontal shaft 51 is provided, 100 ″ is attached, and in this case 100 ″, there is a cam 102 ″ fixed around the planting drive horizontal shaft 51, and a coil spring provided in the front (not limited) of the planting drive horizontal shaft 51. A torque leveling mechanism 101 ″ including 103 ″ is accommodated.

  In the torque leveling mechanism 101 ″, for example, the coil spring 103 ″ has a substantially egg-shaped cam 102 ″ in a side view in which the protruding portion is interposed via the pressing member 110 (which may be an eccentric cam, but is not limited). The cam 102 ″, a part of the cam 102 ″, the pressing member 114, and the coil spring 103 ″ are provided in a case 100 ″ formed in the front portion of the horizontal frame 45 toward the front. In addition, the front-end | tip part of coil spring 103 '' is fixed to the front-end part in case 100 ''.

  Here, as described above, the acceleration / deceleration power transmitted to the planting drive horizontal shaft 51 via the inconstant speed mechanism in the gear case 62 is transmitted to the cam 102 ′ via the shaft rotation of the planting drive horizontal shaft 51. ′ Is rotated, but the coil spring 103 ″ expands and contracts back and forth through the pressing member 114 by the protruding portion of the cam 102 ″.

  At this time, the torque fluctuation generated in the planting drive horizontal shaft 51 is stored in the coil spring 103 ″ in the same manner as described above, and the torque fluctuation generated by using the expansion and contraction motion of the coil spring 103 ″ is the same as the above. By returning the reverse phase torque to the planting drive horizontal shaft 51 as the drive torque, the torque fluctuation can be canceled out.

  For this reason, the stable inconstant speed power without torsional vibration can be transmitted to the planting drive vertical axis 53, and the planting transmission shaft system of the planting part 15 including the planting drive horizontal axis 51 is the above-mentioned. Due to the cause, it is possible to smoothly rotate at a non-uniform speed without twisting or rattling, and in this case the seedling transplanter 1 can stabilize the seedling planting state with the planting claws at high speed. The same effects as described above can be obtained.

  As described in detail above, the mechanical working device of this example takes out the driving force through the mission case 4, and the drive system (mechanical working device) up to the planting claw 17 has a torque leveling function. The torque leveling mechanism 101 uses the elastic force of the coil spring 103 (elastic body) to play backlash caused by a backlash of a gear constituting the drive system or a gap generated between parts during manufacture of the drive system. This is provided in order to suppress the occurrence of uneven rotation of the drive system due to the twist of the drive system.

  In addition, this invention is not limited to the seedling transplanting machine mentioned above, For example, it can apply to all the working vehicles provided with the working machines which have a mechanical working apparatus, such as the rotary working machine of a tractor, and a rotary snowplow.

DESCRIPTION OF SYMBOLS 1 Seedling transplanter 15 Planting part 17 Planting claw 51 Planting drive horizontal shaft 98 Inclined surface 99 Cover 100 Case 101, 101 ', 101''Torque leveling mechanism 102 Crank arm 102 "Cam 103 Coil spring 108, 109 Torque 110 synthetic torque 111 caster 112 roller 113 arm 114 pressing member

Claims (5)

A machine working device that extracts driving force through a mission case,
The drive system of the machine working device is provided with a torque leveling mechanism,
The torque leveling mechanism uses the elastic force of an elastic body to drive the drive due to backlash of gears constituting the drive system or torsion of the drive system due to gaps generated between parts during the manufacture of the drive system. A machine working device provided to suppress the occurrence of rotation unevenness in a system.   The machine operating device according to claim 1, wherein the torque leveling mechanism uses a crank mechanism and a spring.   The machine work apparatus according to claim 1, wherein the work machine is driven from the mission case via a PTO shaft.   The PTO shaft according to claim 3, further comprising a planting drive member that drives the planting arm by driving the planting drive means.   The seedling transplanter according to claim 4, wherein an inconstant speed gear is provided in a transmission shaft system of a drive system including the PTO shaft.

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